Survey- For those with misfire issues

[Idlethunder]

Haven't noticed any weird sound really, but its so new that I haven't really been able to determine what is normal. Only thing I noticed on my way to the dealer this morning is that under the same conditions, cruise control at 65 on flat highway, my current MPG dropped from 23 MPG before the error code to 18 MPG on the display.

I had to drop it off and take an Uber home, this dealer has no loaners and he said he needed to submit the case to Chrysler for them to authorize a rental on Monday if needed. I will be driving my 2000 Wrangler TJ with 179,000 engine light free miles in the mean time. LOL

From what I’ve seen the no loaner thing is pretty much standard these days but on a Jeep as new as yours I’d have thought they would make an exception. With my two service calls they have not kept it overnight so I’ve been able to schedule a ride. I spoke to the GM the first time it was in about a loaner and even though they don’t offer them now, he said they would find me something if I had to leave it for an extended period. Your dealership might not be as accommodating but it might be worth it to go up the chain a little.

When my light came on in July with p0304 I didn’t notice a mileage drop. I was averaging around 17 on short 2 to 20 miles trips before and after the light came on and 18 on longer drives. Last week when it threw p0300 I had just filled up the night before and had around 5 miles on that tank. A week later when I dropped it off at the dealer, I had 210 miles on that tank and was averaging 13.2. After the dealer did their thing and reset the code, I filled up and am back to 17.1.

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[IanNubbit]

When I picked the Jeep up at the dealership this evening, they gave me the publication below. The paper tells them to perform the published diagnostic routine for code P0300. If the diagnostic directs to a condition of trouble not found, no repair is recommended. It also says that engineering is investigating the issue. In my case, trouble was not found so there was nothing recommended.

After talking with the GM and the service manager for half an hour, they said my options are to either (A) wait for the Stellantis engineers to contact them with a recommended repair, (B) continue driving it until it happens again then bring it back in and let them dig deeper, or (C) open a star case. The dealership is sympathetic and willing to work with me. On one hand my gut tells me to open a star case and let them get to the bottom of it. On the other, I am not sure if this is a serious problem or not because I cannot hear or feel anything at all from the engine that I would call a misfire.

The decision is mine but since there are many people on here who are much more knowledgeable than me, I am asking for advice. Is a star case the best way to get to the bottom of a misfire problem or do you think it would be best to wait until it gets worse and let them take another look?

The 22 overland I’m working on is identical. Happened once and. While shut down when it did. Misfired like crazy when monitored on start up but not physically noticeable. I decided to make a Star case because it seemed dumb to hand over a vehicle that literally shit off and say “wait for engineering to figure it out”. They had as take 2 flight recordings with LOADS of data compared to a normal flight recording of me acclerating form 0-35 for 60 seconds. Seems like they have an isolated idea but no repair. This one’s missing on all 6 cylinders so the normal single cam and O2 sensors issues aren’t the culprit here. Customer and dealer both liked my idea of having me drive it for a couple days, truck has been perfect for 3 days now, so they are going to take it back while we wait for a reply from engineering and hope it at least sticks to no issues or only a light in a the mean time

 

[DAVECS2]

When the cams have damage it will misfire and the fuel cooling will hand an injector and shut it down. Letting it sit resets the Injector and it runs fine until you give the beans.

 

[Idlethunder]

The 22 overland I’m working on is identical. Happened once and. While shut down when it did. Misfired like crazy when monitored on start up but not physically noticeable. I decided to make a Star case because it seemed dumb to hand over a vehicle that literally shit off and say “wait for engineering to figure it out”. They had as take 2 flight recordings with LOADS of data compared to a normal flight recording of me acclerating form 0-35 for 60 seconds. Seems like they have an isolated idea but no repair. This one’s missing on all 6 cylinders so the normal single cam and O2 sensors issues aren’t the culprit here. Customer and dealer both liked my idea of having me drive it for a couple days, truck has been perfect for 3 days now, so they are going to take it back while we wait for a reply from engineering and hope it at least sticks to no issues or only a light in a the mean time

Below is a screenshot of monitoring I did yesterday with Jscan. This is from a 20 minute, 10 mile drive. All but 5 of the misfires happened within the first two minutes after putting it in gear. The Jeep had not been started for at least two hours and I let it idle for 45 seconds or so before putting it in gear.

When this started two months ago, the engine sounded fine while idling but for the last month there is a slight engine tick that I could hear when standing beside the Jeep while it is idling. The ticking is not loud enough that I could hear it while driving with the doors and top on. Before I went anywhere yesterday, I took the doors and top off to see if I could hear it and I can hear while driving. I am not a mechanic and the best way I can describe it is that it sounds to me like a Monte Carlo I had back in the 80s with a 305. I had to add a little oil every few fill ups and this sounds a lot like that did when it started getting low on oil. While the Jeep was in the shop last week I had them do the second oil change at 7,700 miles. I checked it yesterday and the oil was right where it should be on the dipstick and looks good. After the ticking started last month, I had Blackstone do an oil analysis. I will try to attach it to this post along with the screen grab of misfires but going by the report everything looks good to me.

What did you do to get the misfires to stop on the 22 Overland? If it comes back in or you hear anything, good or bad, from the owner, please let me know.

 

[winobee]

Purchased a jeep gladiator August 2022, all was fine till it hit 120 miles on the odometer. Driving back from an errand, I stopped at a light and the truck started vibrating. Drove straight to the dealership and they read the codes right away. Misfire on multiple cylinders, kept the truck overnight and the next day they called and recommended an engine replacement. Engine replacement done in a little over a week. The truck seems to be fine for now.
This thread is over 110 pages and it seems like it is still pretty active. So folks are still reporting this issue. Seems like this is a pretty prevalent problem? I am extremely nervous driving this brand new car that I just put a ton of money into. Not a good situation for a first time Jeep buyer. I should say I was warned so the decision was mine but 100 miles! Really?

 

[Idlethunder]

Purchased a jeep gladiator August 2022, all was fine till it hit 120 miles on the odometer. Driving back from an errand, I stopped at a light and the truck started vibrating. Drove straight to the dealership and they read the codes right away. Misfire on multiple cylinders, kept the truck overnight and the next day they called and recommended an engine replacement. Engine replacement done in a little over a week. The truck seems to be fine for now.
This thread is over 110 pages and it seems like it is still pretty active. So folks are still reporting this issue. Seems like this is a pretty prevalent problem? I am extremely nervous driving this brand new car that I just put a ton of money into. Not a good situation for a first time Jeep buyer. I should say I was warned so the decision was mine but 100 miles! Really?

I don’t think it is as common as it sounds on here. Anything like this being online you are going to hear a lot more from the people who have problems than those who don’t. My 22 has been in the shop twice now in the last two months with misfires but other than mine, my dealership only has one other Gladiator owner having the problem and his 2021 model shows completely different symptoms than mine. I too am a little worried but I love the truck so I’m going to work with them to try to get it solved.

 

[themthatknow]

I hate that this is my first post to this forum, because we were super excited when we got our first jeep. We bought the 22 gladiator Texas Trail edition, drove it for 5 weeks, had our first off road trip (woohoo) and got the P0300 w noticeable misfires at 2200 miles.

Dealer has been good to us, gave us a loaner and is replacing the engine. They did a Star case and were told to do so.

That was a week ago, so waiting to get the jeep back. Posting this just as FYI since we’ve experienced it- hoping engine replacement solves the issue and I can get back to it. Best of luck to the rest of you as well.

Also - the loaner is a new Durango, and I couldn’t possibly hate it more than I do, but it gets me to work so I am thankful for it.

 

[Idlethunder]

I hate that this is my first post to this forum, because we were super excited when we got our first jeep. We bought the 22 gladiator Texas Trail edition, drove it for 5 weeks, had our first off road trip (woohoo) and got the P0300 w noticeable misfires at 2200 miles.

Dealer has been good to us, gave us a loaner and is replacing the engine. They did a Star case and were told to do so.

That was a week ago, so waiting to get the jeep back. Posting this just as FYI since we’ve experienced it- hoping engine replacement solves the issue and I can get back to it. Best of luck to the rest of you as well.

Also - the loaner is a new Durango, and I couldn’t possibly hate it more than I do, but it gets me to work so I am thankful for it.

I’m sorry to hear about your experience but hopefully the new engine will fix it. I have pretty well convinced myself to keep driving rather than open a Star case since the only symptoms are the check lights and engine tick. My dealer has been great too and has offer a loaner but so far, I haven’t needed one. I might end up with a Star case at some point but am hoping to avoid that. From what I’ve been told and read on here, it sounds like that can sometimes take a while to resolve. When your case was opened, how long did it take them to come back recommending the engine change?

 

[themthatknow]

I’m sorry to hear about your experience but hopefully the new engine will fix it. I have pretty well convinced myself to keep driving rather than open a Star case since the only symptoms are the check lights and engine tick. My dealer has been great too and has offer a loaner but so far, I haven’t needed one. I might end up with a Star case at some point but am hoping to avoid that. From what I’ve been told and read on here, it sounds like that can sometimes take a while to resolve. When your case was opened, how long did it take them to come back recommending the engine change?

So, Just to make things interesting, I just got off the phone with the dealer and they have halted the process to install the new engine per the people at star.
They told me ‘ we have your new engine right here, it’s got your name on it, and star has told us to wait‘. Very not pleased with that….

here was the time frame- they open the star case The same day they found metal shavings in the oil and re-created the noticeable misfires while driving, which was day one in the shop.
About a week later they told me they got word that they should exchange the engine.
that’s about a week ago, and apparently late on Friday the star people told them to stop what they were doing for some reason. I think that they are may be going to have one of their engineers take a look at the engine to try to figure out what’s happening with engines that have the same problem mine does. But honestly I have no idea.
It seemed quick and easy until today?

 

[Brahmajoe]

TSB 18-071-22,

What’s your build date?

 

[Brahmajoe]

Not new. Originally from April 2022 and also came an RSU or rapid transmittal aimed at specific VNIs

What was that tsb for?

 

[winobee]

So, Just to make things interesting, I just got off the phone with the dealer and they have halted the process to install the new engine per the people at star.
They told me ‘ we have your new engine right here, it’s got your name on it, and star has told us to wait‘. Very not pleased with that….

here was the time frame- they open the star case The same day they found metal shavings in the oil and re-created the noticeable misfires while driving, which was day one in the shop.
About a week later they told me they got word that they should exchange the engine.
that’s about a week ago, and apparently late on Friday the star people told them to stop what they were doing for some reason. I think that they are may be going to have one of their engineers take a look at the engine to try to figure out what’s happening with engines that have the same problem mine does. But honestly I have no idea.
It seemed quick and easy until today?

I was also told by the dealer that my engine had metal shavings in the oil and that is why they were recommending an engine swap. They did not open a star case for me and the engine swap happened within a week. Go figure!

 

[ShadowsPapa]

What was that tsb for?

I can't recall details (they are on my home server and my shop chromebook can't access that device) but as I recall, it was a PCM update to change how it handled misfires.

 

[IanNubbit]

P

Below is a screenshot of monitoring I did yesterday with Jscan. This is from a 20 minute, 10 mile drive. All but 5 of the misfires happened within the first two minutes after putting it in gear. The Jeep had not been started for at least two hours and I let it idle for 45 seconds or so before putting it in gear.

When this started two months ago, the engine sounded fine while idling but for the last month there is a slight engine tick that I could hear when standing beside the Jeep while it is idling. The ticking is not loud enough that I could hear it while driving with the doors and top on. Before I went anywhere yesterday, I took the doors and top off to see if I could hear it and I can hear while driving. I am not a mechanic and the best way I can describe it is that it sounds to me like a Monte Carlo I had back in the 80s with a 305. I had to add a little oil every few fill ups and this sounds a lot like that did when it started getting low on oil. While the Jeep was in the shop last week I had them do the second oil change at 7,700 miles. I checked it yesterday and the oil was right where it should be on the dipstick and looks good. After the ticking started last month, I had Blackstone do an oil analysis. I will try to attach it to this post along with the screen grab of misfires but going by the report everything looks good to me.

What did you do to get the misfires to stop on the 22 Overland? If it comes back in or you hear anything, good or bad, from the owner, please let me know.

so the one we where working on, engendering had us grab aflight recording with like 50 points of data over a 2 minute segment, while slowly acclerating from 0-35mph. Told us to give back to the customer until a repair has been finalized

 

[ShadowsPapa]

Mine is at it again but only under very specific conditions after a drive then stopped for several minutes and restarted. It bucks like a horse. 700+ misfires for cyl 2, 200+ for 4 and 100 for 6.
But only when driven and thoroughly hot then shutdown for a few minutes. Did it in TN after a stop to eat.

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